JUKI AMS-210EN/IP-420 Instruction Manual page 29

[Memory switch settings]
Change the set value of memory switch U69 in accordance with the thickness of needle thread.
Memory switch U69 has been factory-set to S type (0: S type (standard)) or H type (1: H type) (thin
thread). Commendable value is Set value : 1 for thread count #50 to #8, and that is Set value : 3 for
thread count #5 to #2. (The value will change in accordance with the kind and thickness of the actual
thread and the kinds of materials to be sewn. Set the value by adjusting to the state of needle thread
on the wrong side of materials.)
In addition, it is possible to select the thread clamp position by means of memory switch U70. When
the thread slipping off from the needle eyelet at the beginning of sewing or stitch skipping from the
first stitch occurs, set the set value to 0 : Front and use the machine.
(1) When with thread clamp (motion), use the sewing machine after adjusting the needle thread length
at the start of sewing to 40 to 50 mm. When the needle thread length is too long, the needle thread
end held with the needle thread clamp may be rolled in the seams.
1)
3)
3) When needle thread held with the needle thread clamp is rolled in the seams, when error has oc-
curred, or when needle thread is held entangled with the needle thread clamp, do not forcibly draw
the cloth, but cut the connected needle thread with scissors or the like. The seams cannot be broken
because of the needle thread at the start of sewing.
(2) When the thread clamp is used, and bobbin thread at the sewing start appears on the right side of
material, reduce thread tension at the sewing start (2 to 3 stitches) and bobbin thread becomes less
conspicuous.
[Example of setting] Tension of 1 to 2 stitches at the sewing start is "20" when sewing tension setting
is "35".
* For setting of tension at the start of sewing, see of
1. Thread at the start of sewing may be rolled in case of some patterns. When thread is
rolled in even after performing adjustment of (1) or (2), use the sewing machine with
thread clamp OFF.
2. Thread clamp failure may occur in the state that thread waste is jammed in the thread
clamp device. Remove the thread waste referring to
"#-1-6. Needle thread clamp device"
40 to 50mm
p.119.
– 25 –
1) In case of with the needle thread clamp, the
standard of the length of needle thread is 40 to
50 mm.
• To prevent the thread from slipping off from the
needle eyelet at the beginning of sewing or to
prevent stitch skipping from the first stitch
/ Adjust the length of needle thread longer
within the range.
• To prevent stitch skipping within the second to
tenth stitches from the beginning of sewing
/ Adjust the length of needle thread shorter
within the range.
2) When the needle thread is excessively long or
is handled by hand after thread changing or the
like, turn OFF NEEDLE THREAD CLAMP but-
ton .
"@-2-8.(1) Editing the thread tension" p.43.